Duct seal for joining duct boards



FIG. 1 is a front perspective view of a duct seal for joining duct boards showing my new design including an h-shaped duct lock member and a locking plate;

FIG. 2 is a rear view of the h-shaped duct lock member, which forms a portion of the duct seal for joining duct boards;

FIG. 3 is a rear view of the locking plate, which forms a portion of the duct seal for joining duct boards; and,

FIG. 4 is an exploded view illustrating the duct seal for joining duct boards coupling two duct boards with the use of fasteners.

The broken lines illustrating duct boards and fasteners are provided for illustration purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a duct seal for joining duct boards, as shown and described. 